From b3c78fae27ed5313c06aea24fcd5d8ea13a21fab Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@systemlinux.org>
Date: Thu, 27 Jan 2011 08:44:38 +0100
Subject: [PATCH] gui: Recognize "home" and "end" keys.

And map them to new functions which scroll to the top and the bottom of
the output window.
---
 gui.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/gui.c b/gui.c
index 3b001a7d..42e7dd07 100644
--- a/gui.c
+++ b/gui.c
@@ -109,6 +109,8 @@ static void com_scroll_up(void);
 static void com_scroll_down(void);
 static void com_page_up(void);
 static void com_page_down(void);
+static void com_cancel_scrolling(void);
+static void com_scroll_top(void);
 
 static struct gui_command command_list[] = {
 	{
@@ -186,6 +188,16 @@ static struct gui_command command_list[] = {
 		.name = "page_down",
 		.description = "scroll down one page",
 		.handler = com_page_down
+	}, {
+		.key = "<home>",
+		.name = "scroll_top",
+		.description = "scroll to top of buffer",
+		.handler = com_scroll_top
+	}, {
+		.key = "<end>",
+		.name = "cancel_scroll",
+		.description = "deactivate scroll mode",
+		.handler = com_cancel_scrolling
 	}, {
 		.handler = NULL
 	}
@@ -230,6 +242,14 @@ static char *km_keyname(int c)
 		sprintf(buf, "<ppage>");
 		return buf;
 	}
+	if (c == KEY_HOME) {
+		sprintf(buf, "<home>");
+		return buf;
+	}
+	if (c == KEY_END) {
+		sprintf(buf, "<end>");
+		return buf;
+	}
 	if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 		if (c < 0)
 			c += 256;
@@ -1097,6 +1117,41 @@ static void print_scroll_msg(void)
 		filled - scroll_position, ringbuffer_filled(bot_win_rb));
 }
 
+static void com_scroll_top(void)
+{
+	int i = RINGBUFFER_SIZE - 1;
+	unsigned lines = 0;
+
+	while (i > 0 && !ringbuffer_get(bot_win_rb, i))
+		i--;
+	/* i is oldest entry */
+	for (; lines < bot.lines && i >= 0; i--) {
+		struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
+		if (!rbe)
+			break;
+		lines += NUM_LINES(strlen(rbe->msg));
+	}
+	i++;
+	if (lines > 0 && scroll_position != i) {
+		scroll_position = i;
+		redraw_bot_win();
+		print_scroll_msg();
+		return;
+	}
+	print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
+}
+
+static void com_cancel_scrolling(void)
+{
+
+	if (scroll_position == 0) {
+		print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
+		return;
+	}
+	scroll_position = 0;
+	redraw_bot_win();
+}
+
 static void com_page_down(void)
 {
 	unsigned lines = 0;
-- 
2.30.2